;;; guile-openai --- An OpenAI API client for Guile
;;; Copyright © 2023 Andrew Whatson <whatson@tailcall.au>
;;;
;;; This file is part of guile-openai.
;;;
;;; guile-openai is free software: you can redistribute it and/or modify
;;; it under the terms of the GNU Affero General Public License as
;;; published by the Free Software Foundation, either version 3 of the
;;; License, or (at your option) any later version.
;;;
;;; guile-openai is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
;;; Affero General Public License for more details.
;;;
;;; You should have received a copy of the GNU Affero General Public
;;; License along with guile-openai.  If not, see
;;; <https://www.gnu.org/licenses/>.

(define-module (openai utils stream)
  #:use-module (srfi srfi-41)
  #:export (stream-filter-map))

(define (stream-filter-map proc strm)
  (stream-let loop ((strm strm))
    (if (stream-null? strm)
        stream-null
        (let ((result (proc (stream-car strm))))
          (if result
              (stream-cons result (loop (stream-cdr strm)))
              (loop (stream-cdr strm)))))))
